Improvement im fire-proof shutters



A. GUTTLIEB.

Fire-Proof Shuters.

N0, 142,563, PatentedSepmberQ,87S.

ooo ooo 542--- ooo- .ozao-l Lkj UNITED IMPROVEMENT IN FIREPROOFSHUTTERS.

. Specification forming part of Letters Patent No. 142,563, datedSept-amber 9, 1873; application lcd July 15, 1873. l

This invention has for its object to so eon struct iron doors andoutside shutters in a eellular forni as to combine lightness and economyof cost with efficiency to resist the transmission of external heat, andto afford a ventilation for the room closed by them; and it consists ina t'ranie of channel-iron having secured to it an outer and innercovering of sheet-iron divided into cells by vertical channel-bars,which, as well as the coveringplates, are perforated, which perforationsare on varying planes, to prevent the passage of llame.

Figure l shows a double-Win ged shutter, the outer plate of each halt'being partially broken away to show the internal construction. Fig. 2 isa cross-section at a: as.

In the drawing, A represents the frame of the shutter, made ofchannel-iron, as affording great stiffness with ainininiunl of weightand cost. The frame is divided by vertical channelbars A', riveted attop and bottom. B isthe inner covering of sheet-metal plates, and B isan outer covering of the saine material, both riveted to the maintraine.

a are sets ot' apertures in the frame A, bars A', and coveringplates, notwo sets being on the saine horizontal plane, so as to preclude thepassage of iaine, While they serve not only to ventilate the buildingduring the night and days when it is closed, but when the outer platesare heated from an adjacent coniagration a strong draft of air isestablished between the plates, keeping the inner one cool, and thuspreventing dainage to the interior of the protected building or itscontents. For this purpose the bottoni bars of the frames areperforated, as shown in Fig. 1, and for the purpose of allowing water todow oli' which may accumulate therein.

What I clainl as my invention, and desire to secure by Letters Patent,is-

l. A double-walled iron shutter divided into cells by verticalchannel-bars, substantially as herein described and shown. l

2. In a cellular double-walled shutter, constructed substantially asherein described, the pertbrations a in the bottom bar, the verticalchannel-bars, and the covering-plates, when arranged in dii'erenthorizontal planes, substantially as described.

ABRAHAM GOTTLIEB. Witnesses:

WM. H. Lorz, SIEGESMUND ENDER.

` .ii rrron.

